/Engine/Source/Runtime/Engine/Classes/Animation/AnimCompress.h
Common compression utility to remove 'redundant' rotation keys in a set of tracks based on the provided delta threshold
static void FilterTrivialRotationKeys ( [TArray](API\Runtime\Core\Containers\TArray)< struct [FRotationTrack](API\Runtime\Engine\Animation\FRotationTrack) > & InputTracks, float MaxRotDelta )